Improved sttferheating-device for steam and other generators



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WRIGHT sIITH, or sT. LOUIS', MISSOURI.

Letters Patent No. 96,046, dated October 1 9, 1869.

IMPROVBD SUPERHEATING-DEVCE FOR STEAM. OTHER GENERATORS.

The Schedule referred to in theseLetters Patent and making part of thesame To all' whom it may concern:

Be it known that I, WRIGHT SMITH, of St. Louis, in the county of St.Louis, and State of Missouri, have made certain newand useful ImprovedApparatus for Superheating Steam and other purposes; and I doherebydeclare that the following is a full and clear descriptiinthereof, reference being had to the accompanying thereon.

'.lhis invention relates to the manner of superheating steam by heatedair, and to the manner of retlirning the air after its utilization forsuperheating vto the furnace-chamber, the feature of said inventionbeing applicable to ordinary boilers, and operating with ecolivomy offnel.

To enable those herein skilled to make and use my said invention, I willnow more fully describe the same, referring herein to the accompanying-Figure 1*, as a sectional elevation; to

Figure 2, as a front View of an ordinary stationary boiler and'fnrnace,with an attachment of the devices referring more especially to thisinvention.

I arrange the boiler A in any of its usual forms, so as to receive heatfrom the furnace B, the gases of combustion being guided to pass overthe bridge-wall C, in the passage 1), to the rear end of the boiler, andenter the fines a, then passing to the front of the boiler to escape bythe chimney or smoke-stack D.

It is, however, to be understood that the nature of the special featuresof this invention do not limit the application thereof to the form offurnaces and ues before described, or to any other specific form.

In connection with said boiler A, by the pipe E, I arrange thesuperheater F, the same having a number of tubes f, fitted into properheads at the ends ofthe main cylinder of the superheat-er.

Thus thesteam from the boiler A, passing into the superheat'er,surrounds theues f, and may escape by the steam-pipe G Wheneverpermitted.

1n order to heat the steam `iu the vessel F, as in the nature of thisinvention, I arrange the hot-air pipes H about at the top of the furnaceB, the same receives air at its outer end, where it terminates in theface wall of the furnace, and passes the air to the rear, and then risesand'ret-urns to a joint with the rear end of the superheater.

rawings, and to the letters of reference marked' YThis air-pipe is, byits position, therefore, subject to the heat of the fuel of the furnace,and especially to the heated products of combustion as theypas's'to-.the rear of the boiler, and the air in said pipe thus be comesintensely heated, and, passing through the iues f, imparts its heat tothe steam iu the superheating vessel, to dry the said steam andincreaseits expansive force. l

From the superheater the air passes, by a returnpipe, I, to the forwardend of the furnace B. The end t of said return-pipe is, however, curvedso as to deliver the air in the direct-ionof 4the draught ot' hot' gasesfrom the furnace.

By' this means the pressure produced by the tendency to rise in the hotproducts of combustion aids the discharge of the air out of thereturn-pipe I, and the air thus returned to the furnace gives up so muchof its heat as remains to the combustion at the furnace, thus utilizingthe same very fully.

The return-pipe I may deliver the spent air to the smoke-stack orchimney, aiding the draught therein, butin this arrangement the heat insaid ai'r,as discharged, is nt fully utilized.

The said device is, by its simplicity of form and economy of action andconstruction, adapted formany purposes in the arts.

Thus, when in the use of an ordinary boiler and steam-pipe, water iscarried to the engines or to renf dering-tanks for tallow, lards, and soon, by the use of my said superh'eater', the steam may be dried, and thewater, which before was wasted, will be utilized;

and lastly, said devices present all the advantagesordinarily achievedby the use of super-heaters.

Having thus fullydescribed my said invention,

1. The furnace B, hot-air pipe H, superheater F, and its tubes f, andthe return-pipe I, combined substantially as set forth. i

2. The return-pipe I, arranged to deliver the air to the furnace B, inthe direction of the draught of the hot gases in said furnaces,substantially'asset forth.

' WRIGHT SMITH.

Witnesses WILLIAM W. HERTHEL, J. W. Hnnrunn.

